Advice for 4b 17 year old experimenting with braids

Hi all.

Advice for my sister

My younger sister (17) has short 4b hair. It’s in that awkward length where you can have a cute afro and it’s not long enough for a bun. So this fall (from October and onwards) we decided to start braiding her hair (with extensions). She’s absolutely loves it and now refuses to be seen without it. Since October our mom has braided her hair three times. She’s kept her braids in for give or take six weeks where her hair has been given about a week break from removing to installing new braids. I don’t know if I’m being paranoid in noticing her hairline thinning. I myself have experienced hairline thinning due to slicked hairstyles, so I’m terrified of her experiencing that as well.

So any advice on her to deal/maintain braids while keeping her hair healthy?